Battery charger



FIG. 1 is a front, top, and left side perspective view of a battery charger showing my new design;

FIG. 2 is a rear, bottom and right side perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof; and

FIG. 8 is a bottom plan view thereof. 

The ornamental design for a battery charger, as shown. 